1.1: platinum(IV) oxide; hydrogen / tetrahydrofuran / 1 h / 24 °C 2.1: n-butyllithium / tetrahydrofuran; hexane / 1 h / -78 °C / Inert atmosphere 2.2: 17 h / -78 - 0 °C / Inert atmosphere 3.1: AlCl3, aluminium chloride; ethane-1,2-dithiol / nitromethane / 0.5 h / -20 °C View Scheme